I have just gotten my first two dalmatian marked rats from my own breeding, a black and white het. dove/het mink male from one litter and one black/white poss.het mink female from another litter. I'm saving them to breed together later.
I got them from breeding capped rats together with variegated. Capped in my case is one or two copies of a high white gene + possibly hooded + variegated.
I crossed these capped rats with a male high white sided, freckled/snowflake pattern variegated, if I remember the pairing correctly. That or the male was a mink capped male. In either case I now have dalmatian rats, which I believe to be a combo of the high white gene (simple gene of this causes a white line from belly up under bottom jaw in hooded and variegated) x 2, variegated gene x2.
Just tonight I mated some of the females with my very nice black/white variegated het mink, het dove male again, so I will have some more babies coming along in a few weeksThe females are variegated mink, variegated black/white, and dove capped.
Sadly I can not help you with your rats though, since I'm over in sweden :/ But the genetics are cool! Took me one year worth of breeding before I had dalmatian, so if that's what you want then you might have done the right thing to simply buy some. If you don't know the ingredients then I think it's a hard coloration to stumble across in your breeding! It was a lot of selective breeding that got them out, I tell you that.